Slow loading without indicator

[roym899]

Not entirely sure if this is due to a slow connection on my side or not; but sometimes the viewer seems to be be loading quite slowly without any indicator that it is loading at all (just showing the white background).

It would be nice to add a progressbar similar to here.

[radames]

hi @roym899 , that's a great point! @jleibs @jprochazk do you know if we can listen to signals from rr = new WebViewer(); too add the progress bar to the custom component?

[jprochazk]

I think the best course of action here would be to add a loading spinner